Miss Susan is a daytime drama which aired on NBC from March 12 to December 28, 1951. The show, originating from Philadelphia and later retitled Martinsville, U.S.A., aired for fifteen minutes at 3:00 p.m. ET on weekdays. The main writer was William Kendall Clarke.

A recently widowed woman hires a struggling P.I. to spend some time with her stepdaughter, still distraught over her wealthy father's fatal horse-riding accident. He comes to believe it was no accident, and resolves to identify the killer.